Bluetooth Health Wrist Smart Band Watch Monitor/Smart Bracelet/Health Bracelet/Smart Watch for Mens/Activity Tracker/Bracelet Watch for Men/Smart Fitness Band/ Smart Fitness Band Activity Tracker with Heart Rate Sensor Compatible for All Androids and iOS Phone/Tablet Functions: 1.Heart Rate Monitor 2.Sedentary reminder 3.Calories 4.Time 5.Alarm 6.Anti-lost 7.Distance calculation 8.Step Monitor 9.Call Alert 10.Wrist sense Pre-requisites for use: Your mobile phone Bluetooth version must be Bluetooth 4.0 or higher, Android version must be Android above, Android version must be Android 4.3 or above. Working: To connect the smart band to mobile phone, you need to connect the current mobile successfully via Bluetooth. Click unbind icon and band has been successfully connected with the device.